I'm not very knowledgeable about bikes (yet). I'm searching for a decent road bike but do not want to pay a fortune. I found this Cannondale "R30"? (which I haven't been able to find any info on) series bike at a pawn shop. It's got Shimano Dura Ace everything as far as I can tell. How can I find out how much it's worth? They're asking ~$350.